Speed of sound in seawater at high pressures

Chen Tung Chen, Frank J Millero

Research output: Contribution to journalArticle

262 Citations (Scopus)

Abstract

The speed of sound in standard seawater (diluted with pure water and evaporated) has been measured relative to pure water with a Nusonics single-transducer sound velocimeter as a function of salinity (5–40 o/oo), temperature 0°-40°C, and applied pressure (0–1000 bars). The effect of pressure on the relative speeds of sound, (Up-Up H2 0)-(Uo-U oH2 0), have been fitted to an equation of the form (with a standard deviation of 0.19 msec-1) (Up-upqhu0-UoH2O)=AS(0/oo) + BS(°/oo)^2+ CS(°/oo)2, where U and U H2 0 arethe speeds of sound in seawater and pure water, respectively; superscripts P and O are used to denote applied pressure P and O (1 atm); A, B, and C are temperature-and pressure-dependent parameters; S(o/oo) is the salinity in parts per thousand. This equation has been combined with the refitted high-pressure pure-water sound-speed equation of Wilson [Naval Ordnance Lab. Rep. (1959)], Chen and Millero [J. Acoust. Soc. Am. 60, 1270–1273 (1976)], and the 1-atm seawater sound-speed data of Millero and Kubinski [J. Acoust. Soc. Am. 57, 312–319 (1975)] to calculate the speeds of sound for seawater at various salinities, temperatures, and pressures. Our results agree with the work of Wilson on the average to 0.36 msec-1over the range of 5 to 40 °/oo salinity, 0° to 3 °C, and 0 to 1000 bars. Over the oceanic range our results agree on the average with the work of Wilson to 0.3 msec-1(maximum deviation 0.6 msec-1), and with the work of Del Grosso to 0.5 msec-1(maximum deviation 0.9 msec-1). The better agreement of our results with those of Wilson may be fortuitous since our measurements were made relative to his pure-water data.

Original languageEnglish (US)
Pages (from-to)1129-1135
Number of pages7
JournalJournal of the Acoustical Society of America
Volume62
Issue number5
DOIs
StatePublished - 1977

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salinity
acoustics
water
sound transducers
ordnance
deviation
temperature
Sound
standard deviation
Water
Salinity
Temperature
Equations
Deviation

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Arts and Humanities (miscellaneous)

Cite this

Speed of sound in seawater at high pressures. / Chen, Chen Tung; Millero, Frank J.

In: Journal of the Acoustical Society of America, Vol. 62, No. 5, 1977, p. 1129-1135.

Research output: Contribution to journalArticle

Chen, Chen Tung ; Millero, Frank J. / Speed of sound in seawater at high pressures. In: Journal of the Acoustical Society of America. 1977 ; Vol. 62, No. 5. pp. 1129-1135.
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